Hydrostatic Guide Device Variable Orifice Stiffness
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Solution Overview
Problem
Conventional hydrostatic guide devices require high machining and assembly accuracy to ensure stiffness, increasing manufacturing costs and man-hours.
Innovation Solution
A hydrostatic guide device with variable orifices and hydrostatic pockets that maintain stiffness regardless of machining and assembly accuracy variations, using a hydraulic pump to regulate fluid pressure and create a non-contact sliding state between guide faces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional hydrostatic guide devices use fixed orifices to regulate fluid pressure, then guidance stiffness can be improved, but machining accuracy and assembly accuracy must be very high to ensure stable stiffness, which increases manufacturing cost and man-hours
Solution Approach 1:
The patent applies the dynamics principle by replacing fixed orifices with variable orifices that automatically adjust their opening size in response to changes in the gap between guide faces. This dynamic adjustment allows the system to maintain stable guidance stiffness even when machining or assembly accuracy varies, as the variable orifices compensate for gap variations by regulating fluid pressure accordingly.
Solution Approach 2:
The patent implements feedback through the variable orifice mechanism that senses gap changes between guide faces and automatically adjusts fluid pressure to maintain constant stiffness. The system continuously monitors the gap condition and provides corrective action through pressure regulation, eliminating the need for high machining and assembly accuracy while ensuring stable guidance performance.
2Reliability
If high machining accuracy and assembly accuracy are required to ensure stable guidance stiffness, then guidance stiffness can be maintained, but manufacturing cost and man-hours increase
Solution Approach 1:
The patent applies self-service through the variable orifice system that automatically regulates fluid pressure based on gap conditions without requiring external intervention or high-precision manufacturing. The system serves itself by detecting gap variations and adjusting pressure accordingly, thereby maintaining reliable guidance stiffness while allowing for standard, cost-effective machining and assembly processes.
3Reliability
If variable orifices are used to regulate fluid pressure, then guidance stiffness becomes stable regardless of accuracy variations, but device complexity increases
Solution Approach 1:
The patent uses the variable orifice as an intermediary element between the fluid supply and the hydrostatic pockets. This intermediary component automatically mediates pressure regulation in response to gap changes, providing stable guidance stiffness without requiring complex external control systems. The variable orifice acts as a simple yet effective mediator that translates gap variations into appropriate pressure adjustments.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures stable high stiffness between guide faces with reduced manufacturing complexity and cost, allowing for accurate machining operations.
Implementation Method 1
a hydraulic pump (33), variable orifices (24), and hydrostatic pockets (34, 35)... a first fluid pressure (P1) supplied into the hydrostatic pocket (34) through the variable orifice (24), and a second fluid pressure (P2) supplied into the hydraulic pocket (35)
Implementation Method 2
a first fluid pressure (P1) supplied into the hydrostatic pocket (34) through the variable orifice (24)
Implementation Method 3
hydrostatic pockets, which are recesses, are formed in one of opposed faces of the two members that move relative to each other, and a fluid such as air or oil is spouted from the hydrostatic pockets to form a fluid outflow layer having a predetermined thickness between the two members
Implementation Method 4
a first urging force (F1) generated by the first fluid pressure (P1), and a second urging force (F2) generated by the second fluid pressure (P2)... the first urging force (F1) and the second urging force (F2) are balanced with each other
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A hydrostatic guide device includes: a fixed member (19) having vertical guide faces (16a, 17a); a movable member (14) having vertical slide faces (14a1, 14a2); a fluid supply device (33); a hydrostatic pocket (34) to which a first fluid pressure (P1) based on a dimension of a gap (L1) is applied, and that urges the movable member with a first urging force (F1); and a hydraulic pocket (35) to which a second fluid pressure (P2) based on a dimension of a gap (L2) is applied, and that urges the movable member with a second urging force (F2). A variation of the second fluid pressure (P2) is smaller than a variation of the first fluid pressure (P1). When the first urging force and the second urging force are balanced with each other in a horizontal direction, the gap (L1) between the vertical guide face (16a) and the vertical slide face (14a1) becomes a set value.